All locations, where courses are offering, have no departments

   
SQL> create table departments
  2  ( deptno NUMBER(2)     constraint D_PK
  3                         primary key
  4  , dname  VARCHAR2(10)
  5  , location VARCHAR2(8)
  6  , mgr    NUMBER(4)
  7  ) ;

Table created.

SQL>
SQL> insert into departments values (10,'ACCOUNTING','NEW YORK',7);

1 row created.

SQL> insert into departments values (20,'TRAINING',  'DALLAS',  4);

1 row created.

SQL> insert into departments values (30,'SALES',     'CHICAGO', 6);

1 row created.

SQL> insert into departments values (40,'HR',        'BOSTON',  9);

1 row created.

SQL> create table offerings
  2  ( course     VARCHAR2(6)
  3  , begindate  DATE
  4  , trainer    NUMBER(4)
  5  , location   VARCHAR2(8)
  6  ) ;

Table created.

SQL> insert into offerings values ('SQL',date '2009-04-12',13,'DALLAS' );

1 row created.

SQL> insert into offerings values ('OAU',date '2009-08-10',4,'CHICAGO');

1 row created.

SQL> insert into offerings values ('SQL',date '2009-10-04',1,'SEATTLE');

1 row created.

SQL> insert into offerings values ('SQL',date '2009-12-13',1,'DALLAS' );

1 row created.

SQL> insert into offerings values ('JAV',date '2009-12-13',4,'SEATTLE');

1 row created.

SQL> insert into offerings values ('XML',date '2000-02-03',1,'DALLAS' );

1 row created.

SQL> insert into offerings values ('JAV',date '2000-02-01',11,'DALLAS' );

1 row created.

SQL> insert into offerings values ('PLS',date '2000-09-11',8,'DALLAS' );

1 row created.

SQL> insert into offerings values ('XML',date '2000-09-18',NULL,'SEATTLE');

1 row created.

SQL> insert into offerings values ('OAU',date '2000-09-27',13,'DALLAS' );

1 row created.

SQL> insert into offerings values ('ERM',date '2001-01-15',NULL, NULL    );

1 row created.

SQL> insert into offerings values ('PRO',date '2001-02-19',NULL,'DALLAS' );

1 row created.

SQL> insert into offerings values ('RSD',date '2001-02-24',8,'CHICAGO');

1 row created.

SQL>
SQL> select o.location from offerings o
  2  minus
  3  select d.location from departments d;

LOCATION
--------
SEATTLE


SQL>
SQL>
SQL> drop table offerings;

Table dropped.

SQL> drop table departments;

Table dropped.

SQL>

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All locations, where courses are offering, have no departments : Minus « Result Set « Oracle PL / SQL

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